Change the main navigation to be better structured

[Erioldoesdesign]

The navigation is currently confusing and could benefit from better structure. However, this hugo theme has some limitations on navigation.

https://miro.com/app/board/uXjVOCJtntA=/?moveToWidget=3458764528190750828&cot=14

[Erioldoesdesign]

Screenshot of the suggested nav in Miro

[Erioldoesdesign]

@oilsinwater I might need your help here too - this is tricky due to several reasons which are complicated to type out...